US1787512A - Scissors - Google Patents

Description

Filed June 29, 1928 gwum'vfor/ I v v 92 I r 1.

1 Norm @110,

Patented Jan; 6, 1931 THOMAS s. CRAMZPTON, or rronnnnvrnnn, IDAHO sorssonspf Application filed .l'nne 29,

This invention relates to scissors, one of the ob ects belng to lmprove upon the structure of devices of this type whereby the shear- I ing action will be improved greatly, the cutting edges will be prevented from binding against the opposed blades at points back of the cutting edges, said cutting edges will be caused'properly to Cooperate throughout the length thereof, and wear upon the bearing .10 portion and upon the blades can be compensated for readily. v V,

With, the foregoing and other objects in view which will appear as the description proceeds the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed it being understood that changes in the precise embodiment of the invention herein disclosed may be made within the I zoscope of what is claimed without departing from the spirit oftheinvention.

In the accompanying drawings the preferred form of the invention has been shown.

In said drawings,

v Figure 1 is a plan view.

I Figure 2 is a side elevation;

-Figure 3 is a section-on line 33, Figure 2. Figure l is a section on line l4, Figure 1. Figure 5 is a section on line-55, Figure 1. Referring to the figures by characters of reference 1 and 2 designate the respective blades of the scissors, each having a shank 3 extending therefrom. The free end of each shank merges into an eye 4c produced by coiling the end portion of the shank, the terminal of one of these coils being offset as shown at 5 to constitutea stop against which the opposed shank will abut when the scissors are closed.

Theblades are connected by a'pivot bolt 6 and the meeting faces of the blades are 1101- lowed out or concaved as shown at 7, these concavities extending from the pivot portions of the blades a short distance toward the points of the blades. Close to the pivot 6 and p at that side thereof nearest the eyes 4: there are provided bearing surfaces .8 adapted to contact one with the other, thereby to force the blades toward each other when they are so moved from open to closed positions.

-1928; :Seria1 a sassin. 1

The twoblades areslightly twistedtransversely 'sothat they contact solely at their edges. This eliminates any friction andwear such as generally produced where the cutting edges, slidably engage thefiat faces of the blades between the edges thereof. This will be obvious by referring to Figure 5. V

The pivot bolt 6 is extended through the middle portions of clamping plates 9 which extend transversely of and beyond opposed portions of the blades and bear firmly against the outer-faces thereof. The projecting end portions of these plates are connected adj ustably by bolts 10 adapted to be tightened by means of nuts 11. The scissors are to be used like ordinary ones but will be found superior theretobecause, as a result of the twistimparted to the blades, said blades. will. only contact where their cutting edges cross. there will be no spacing apart of the cutting edges where engaging thematerial being operated on. By providing the concavities 7 it becomes possible, by tightening the bolts 10 to impart an increased lateral tilt to the blades and to'compensate for wear upon the edges The bearingfaces 8 cooperate to insure proper pressure of the cutting edges against each other throughout the length thereof and more particularly adjacent the. points of the blades. The movement of the blades relative to each other is of course limited by the abutment 5 cooperating with one of the shanks 3. I v

lVhat is claimed is: i 7 The combination of pivotally connected blades each provided with a longitudinal cutting edge, each blade having a transverse twist whereby the cutting edges are the only contacting parts ofthe blades remote from the pivot thereof, shanks terminating in eyes, bearing portions integral with and interposed betweenv the blades and their shanks, said portions having straight, substantially parallel side portions, means on one of the. eyes cooperating with one of the shanks for limiting the relative swinging movement of the blades in one direction, there being concavities in the inner faces of the bearing portions adjacent to the pivot and extended Consequently;

7 toward the cutting edges, cooperating project'ing bearing surfaces on said bearing por- '7 tions adjacent to the pivot and between j the pivot and the shanks; means separate. from and adapted to be bodily applied to or jx emoved from the blades, for holding the" blades together, said means including clamp ing plates extending transversely of 'the' blades and mounted onlthe pivot,said plates firmly engaging the outer faces of t'he'bl'ad's adjacent to the pivot and .proj ectingllaterally beyond the blades, and adjustable connec tions between th'e'projecting ends of "the- Q plates,' said plates bearing on the blades at j 7 points directly opposite the'concavities and bearing faces as my OWIl,' I havelhereto aflixedmy signature. r

I THOMASCBAMPTON.

In testiinony that I clailn the foiegoingj" I d

Images